Ultrafiltration Membrane Equipment for Industrial Water Filtration Tasks

Ultrafiltration Membrane Equipment for Industrial Water Filtration Tasks

Ultrafiltration membrane equipment is a complete set of membrane separation water treatment device centered on porous membrane filtering elements for industrial water purification and sewage recycling. As a high-efficiency industrial liquid filter with modular assembly characteristics, this complete equipment is configured with core filter consumables Ultrafiltration Membrane Filter, anti-fouling special Tubular Ultrafiltration Membrane, finished packaged Integrated Ultrafiltration Water Purification Equipment and large-flow modular Industrial Skid Mounted Ultrafiltration Equipment to build graded water treatment solutions matching different water quality pollution loads and system water output. This paper makes an all-round professional analysis on structural composition, pressure-driven separation principle, unified technical indicators, strict factory quality management system and multi-industry practical application scenes of ultrafiltration membrane equipment, helping overseas industrial purchasers finish accurate model selection according to actual project operation conditions.

1. Product Introduction

Ultrafiltration membrane equipment refers to the integral water treatment system with ultrafiltration membrane components as the core filtering medium, matched with supporting pumps, pipelines, automatic backwash units, chemical cleaning assemblies and electric control system. It is not a single membrane filter element, but a complete system that realizes physical interception of impurities in water through membrane sieving effect. According to different assembly forms and applicable working conditions, our ultrafiltration membrane equipment series covers multiple mature products displayed on the official website.

The most basic consumable core of all equipment is Ultrafiltration Membrane Filter, which is divided into hollow fiber structure and tubular structure. When customers need to treat oily wastewater, electroplating wastewater and high-solids waste liquid that are easy to cause membrane blockage, we will adopt open runner Tubular Ultrafiltration Membrane as the core filtering medium inside ultrafiltration membrane equipment, which supports online physical cleaning and greatly improves the anti-fouling ability of the whole system. For medium and small factories with limited installation space and requiring plug-and-play delivery, the pre-assembled Integrated Ultrafiltration Water Purification Equipment is the most cost-effective ultrafiltration membrane equipment solution; for large industrial parks and centralized wastewater treatment stations with high water demand, parallel combined Industrial Skid Mounted Ultrafiltration Equipment can meet the demand of continuous large-volume water treatment.

The overall frame of ultrafiltration membrane equipment is welded with 304 stainless steel as standard configuration, with strong corrosion resistance and structural stability, adapting to indoor production workshops, outdoor sewage treatment stations and semi-open water treatment areas. The mainstream membrane raw material is modified PVDF, which has excellent chemical resistance, oxidation resistance and mechanical tensile strength. The built-in PLC control system can realize automatic backwashing according to time or pressure difference feedback, and reserve CIP chemical cleaning interface to recover membrane flux after long-term operation attenuation.

In the actual industrial water treatment flow, ultrafiltration membrane equipment is mostly used as the pretreatment link of reverse osmosis pure water equipment. It stably removes colloids, suspended solids and microorganisms in raw water, reduces the SDI value of inlet water below 3, effectively avoids pollution clogging of subsequent RO membranes, reduces the frequency of RO system maintenance, and is widely applied in food processing, pharmaceutical production, chemical industry, printing and dyeing and other manufacturing industries.

2. Working Principle

The core working mechanism of ultrafiltration membrane equipment belongs to pressure-driven cross-flow physical sieving separation. After the raw water is pressurized by the feed pump to the stable working pressure of 1.0 bar ~ 4.0 bar, the fluid flows tangentially along the surface or inner wall of the built-in ultrafiltration membrane elements at a certain flow rate.

Water molecules and dissolved small molecular inorganic salts pass through the tiny selective micropores of the membrane layer under pressure to form qualified clean permeate water, which is collected and transported to the clean water storage tank through the water production pipeline. Pollutants such as suspended particles, colloidal flocs, bacterial colonies and organic macromolecules larger than the membrane molecular weight cutoff are physically trapped on the membrane surface. The high-speed cross-flow scouring of raw water continuously takes away most intercepted pollutants with concentrated water, slowing down the deposition speed of dirt on the membrane surface and maintaining stable water production flux for a long time.

Two sets of maintenance mechanisms are embedded in the control program of ultrafiltration membrane equipment to guarantee long-term stable operation. The first one is automatic periodic backwashing, which uses the clean water produced by the equipment to reversely permeate the membrane layer and peel off loose surface dirt, running automatically in daily operation without manual intervention. The second one is regular CIP chemical cleaning: acid detergent removes inorganic scale precipitation, alkaline detergent decomposes organic pollutants and biological film when backwashing cannot restore the rated water yield of the equipment. If the ultrafiltration membrane equipment is equipped with tubular membrane elements, online sponge ball physical scrubbing can be added as an auxiliary cleaning means to cope with harsh high-fouling wastewater conditions.

3. Technical Parameters (No hyperlinks in this whole section)

3.1 Core Ultrafiltration Membrane Matching Parameters

1. Standard membrane material: Modified industrial PVDF; PES membrane optional for food & pharmaceutical sanitary scenes

2. Optional MWCO grades: 30 kDa, 50 kDa, 100 kDa

3. Effective membrane pore diameter range: 0.01 μm ~ 0.1 μm

4. Continuous allowable operating temperature: 5℃ ~ 45℃

5. pH adaptability range: Continuous operation pH 2–11; short-term cleaning pH tolerance 1–13

6. Standard design flux range: 20 ~ 85 LMH (adjusted by raw water pollution load)

3.2 Whole Ultrafiltration Membrane Equipment Operating Index

1. Optimal stable working pressure: 1.5 bar ~ 3.0 bar

2. Overall system water recovery rate: 82% ~ 93%

3. Effluent turbidity index: Steadily less than 0.1 NTU

4. Bacteria and coliform interception efficiency: ≥99.99%

5. Outlet water SDI value: ≤3, fully satisfy the inlet water standard of reverse osmosis equipment

3.3 Equipment Hardware Configuration Parameters

1. Frame material: 304 stainless steel integrated skid frame

2. Control mode: PLC + touch screen intelligent automatic control with fault alarm function

3. Adjustable automatic backwash cycle: 15 min ~ 60 min

4. Recommended chemical cleaning cycle: 2 ~ 6 months according to actual inlet water pollution

5. Customizable water production tonnage: 1T/h, 5T/h, 15T/h, 50T/h, 100T/h mainstream standard specifications

4. Product Quality & Manufacturing Standards

Every set of ultrafiltration membrane equipment produced by LEFILIER implements full-process closed-loop quality inspection from raw material incoming inspection to finished product delivery. Before membrane assembly, each batch of membrane filter elements must pass 100% bubble point integrity test to screen out defective products such as fiber fracture, membrane wall pinholes and sealing leakage, ensuring the absolute barrier interception performance of the core membrane material.

Stainless steel frame welding and internal pipeline connection adopt professional argon arc welding process; all water-wetted contact components use anti-corrosion materials to prevent secondary pollution to effluent water quality. After the overall assembly is completed, each set of ultrafiltration membrane equipment will complete FAT factory acceptance test before leaving the factory, simulate real water inlet working conditions to test water yield stability, pressure difference fluctuation, valve action response and automatic program execution logic, and deliver products only after all test indicators are fully qualified.

Our ultrafiltration membrane equipment series has obtained ISO9001 quality system certification, CE EU safety certification and NSF61 drinking water material safety certification. Under standardized operation and regular cleaning maintenance, the service life of built-in PVDF membrane components is 5–8 years for hollow fiber type and 6–8 years for tubular type, effectively reducing the long-term spare parts replacement and equipment maintenance costs for enterprise users. Each finished equipment is attached with complete operation manual and quality inspection report for production batch traceability and after-sales service support.

5. Application Fields

Supported by diversified structural forms and stable filtering performance, ultrafiltration membrane equipment is widely applied in multiple industrial and municipal water treatment fields:

1. Pure water pretreatment for manufacturing industry: Remove colloids and microorganisms in raw water to protect downstream reverse osmosis membrane elements and extend RO service life

2. Industrial wastewater recycling: Tertiary advanced treatment of factory biochemical wastewater for workshop flushing, cooling water replenishment and green landscape irrigation

3. Municipal surface water purification: Purify river water and lake water to prepare factory self-supplied production water and domestic domestic water

4. Food and beverage processing water treatment: Purify brewing, dairy and fruit juice production water to remove microorganisms while retaining natural nutrients in water

5. Pharmaceutical purified water preparation: Remove pyrogen and endotoxin as the core filtering unit of pharmaceutical production water system

6. Electroplating, printing and dyeing, petrochemical wastewater treatment: Tubular ultrafiltration membrane equipment separates oily pollutants and suspended solids to realize wastewater standard discharge and water resource reuse

FAQ 

Q1: What is the difference between hollow fiber and tubular ultrafiltration membrane equipment?

A: Hollow fiber membrane equipment has large membrane area per unit volume and low overall cost, suitable for clean raw water and low-pollution conventional sewage treatment; tubular membrane equipment has open flow channels, strong anti-blocking performance and supports physical cleaning, specially used for oily wastewater and high suspended solids wastewater treatment.

Q2: Can ultrafiltration membrane equipment remove dissolved salt substances and reduce the TDS value of water?

A: Ultrafiltration membrane only intercepts particulate pollutants and microorganisms, dissolved salt ions can freely pass through membrane pores. If desalination treatment is required, this membrane equipment must be used as pretreatment matched with reverse osmosis membrane system.

Q3: How often does ultrafiltration membrane equipment need chemical cleaning during normal operation?

A: Automatic backwash runs every 15–60 minutes daily without chemicals; regular CIP chemical cleaning is carried out every 2–6 months according to inlet water pollution degree to eliminate organic biofilm and inorganic scale on the membrane surface.

Q4: What behaviors will cause irreversible damage to ultrafiltration membrane components?

A: Long-term neglect of membrane cleaning, excessive operating pressure, over-temperature inlet water and direct contact of membrane materials with strong acid-base liquid will cause permanent fouling or damage to the membrane, shortening the service life seriously.

Q5: Can the existing common ultrafiltration equipment be directly refitted into tubular ultrafiltration membrane equipment?

A: Direct replacement is not recommended. Tubular membrane needs supporting circulating pipelines and sponge ball cleaning components. It is suggested to select matched complete equipment according to actual water volume and water quality parameters.

Q6: Why is modified PVDF the mainstream membrane material for ultrafiltration membrane equipment?

A: PVDF material has outstanding acid and alkali resistance, oxidation resistance, mechanical strength and anti-fouling performance, adapts to most industrial water quality environments, and can keep stable performance after repeated chemical cleaning, which is far superior to PP and PES materials in harsh working conditions.

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